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                    2.4 HA HDFS 集群管理命令
            
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                                <h1 id="24-ha-&#x96C6;&#x7FA4;&#x7BA1;&#x7406;&#x547D;&#x4EE4;">2.4 HA &#x96C6;&#x7FA4;&#x7BA1;&#x7406;&#x547D;&#x4EE4;</h1>
<p>&#x5230;&#x76EE;&#x524D;, HA NameNodes &#x5DF2;&#x7ECF;&#x914D;&#x7F6E;&#x6210;&#x529F;, &#x5E76;&#x6210;&#x529F;&#x542F;&#x52A8;.</p>
<p>&#x8FD8;&#x6709;&#x4E00;&#x4E9B;&#x5176;&#x4ED6;&#x547D;&#x4EE4;&#x53EF;&#x4EE5;&#x5E2E;&#x52A9;&#x6211;&#x4EEC;&#x53BB;&#x7BA1;&#x7406; HA HDFS &#x96C6;&#x7FA4;. </p>
<pre class="language-"><code class="lang-bash">/opt/module/ha &#xBB; bin/hdfs haadmin                                                               atguigu@hadoop201
Usage: haadmin
    <span class="token punctuation">[</span>-transitionToActive <span class="token punctuation">[</span>--forceactive<span class="token punctuation">]</span> <span class="token operator">&lt;</span>serviceId<span class="token operator">&gt;</span><span class="token punctuation">]</span>
    <span class="token punctuation">[</span>-transitionToStandby <span class="token operator">&lt;</span>serviceId<span class="token operator">&gt;</span><span class="token punctuation">]</span>
    <span class="token punctuation">[</span>-failover <span class="token punctuation">[</span>--forcefence<span class="token punctuation">]</span> <span class="token punctuation">[</span>--forceactive<span class="token punctuation">]</span> <span class="token operator">&lt;</span>serviceId<span class="token operator">&gt;</span> <span class="token operator">&lt;</span>serviceId<span class="token operator">&gt;</span><span class="token punctuation">]</span>
    <span class="token punctuation">[</span>-getServiceState <span class="token operator">&lt;</span>serviceId<span class="token operator">&gt;</span><span class="token punctuation">]</span>
    <span class="token punctuation">[</span>-checkHealth <span class="token operator">&lt;</span>serviceId<span class="token operator">&gt;</span><span class="token punctuation">]</span>
    <span class="token punctuation">[</span>-help <span class="token operator">&lt;</span>command<span class="token operator">&gt;</span><span class="token punctuation">]</span>
</code></pre>
<hr>
<ul>
<li><p><code>transitionToActive</code> and <code>transitionToStandby</code> --- &#x628A;&#x4E00;&#x4E2A;&#x6307;&#x5B9A;&#x7684; NameNode &#x53D8;&#x6210; Active &#x6216;&#x8005; Standby.</p>
<blockquote>
<h4 id="&#x6CE8;&#x610F;"><em>&#x6CE8;&#x610F;:</em></h4>
</blockquote>
<ul>
<li>&#x8FD9;&#x4E2A;&#x547D;&#x4EE4;&#x5E76;&#x4E0D;&#x4F1A;&#x6267;&#x884C;&#x4EFB;&#x4F55;&#x7684; fencing, &#x6240;&#x4EE5;&#x8F83;&#x5C11;&#x4F7F;&#x7528;.</li>
</ul>
<hr>
</li>
<li><p><code>failover nn1 nn2</code> --- &#x5728; 2 &#x4E2A; NameNode &#x4E4B;&#x95F4;&#x521D;&#x59CB;&#x5316;&#x4E00;&#x4E2A; failover.</p>
<p>&#x8FD9;&#x4E2A;&#x5B50;&#x547D;&#x4EE4;&#x4F1A;&#x5F15;&#x8D77;&#x4E00;&#x4E2A; failover &#x4ECE;&#x7B2C; 1 &#x4E2A; NameNode &#x5230;&#x7B2C; 2 &#x4E2A; NameNode.</p>
<ul>
<li><p>&#x5982;&#x679C;&#x7B2C; 1 &#x4E2A; NameNode &#x662F; Standby, &#x8FD9;&#x4E2A;&#x547D;&#x4EE4;&#x4EC5;&#x4EC5;&#x662F;&#x7B80;&#x5355;&#x7684;&#x628A;&#x7B2C; 2 &#x4E2A;&#x53D8;&#x6210; Active.
<img src="http://lizhenchao.oss-cn-shenzhen.aliyuncs.com/1539911277.png-atguiguText" alt=""></p>
</li>
<li><p>&#x5982;&#x679C;&#x7B2C; 1 &#x4E2A; NameNode &#x662F; Active, &#x5219;&#x4F1A;&#x628A;&#x7B2C; 1 &#x4E2A; NameNode &#x4F18;&#x96C5;&#x7684;&#x53D8;&#x6210; Standby. &#x5982;&#x679C;&#x5931;&#x8D25;, &#x9632;&#x62A4;&#x65B9;&#x6CD5;&#x5C06;&#x5C1D;&#x8BD5;&#x76F4;&#x5230;&#x6210;&#x529F;, &#x7136;&#x540E;&#x518D;&#x628A;&#x7B2C; 2 &#x4E2A; NameNode &#x8F6C;&#x53D8;&#x6210; Active. &#x5982;&#x679C;&#x9632;&#x62A4;&#x65B9;&#x6CD5;&#x6CA1;&#x6709;&#x6210;&#x529F;, &#x5219;&#x7B2C; 2 &#x4E2A; NameNode &#x4E0D;&#x4F1A;&#x53D8;&#x6210; Active, &#x5E76;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x9519;&#x8BEF;.</p>
</li>
</ul>
<hr>
</li>
<li><p><code>getServiceState</code> --- &#x68C0;&#x67E5;&#x6307;&#x5B9A;&#x7684; NameNode &#x662F; Active &#x8FD8;&#x662F; Standby.</p>
<p> &#x8FDE;&#x63A5;&#x5230;&#x6307;&#x5B9A;&#x7684; NameNode, &#x7136;&#x540E;&#x786E;&#x5B9A;&#x5B83;&#x7684;&#x72B6;&#x6001;.
 <img src="http://lizhenchao.oss-cn-shenzhen.aliyuncs.com/1539912224.png-atguiguText" alt=""></p>
<hr>
</li>
<li><p><code>checkHealth</code> --- &#x68C0;&#x67E5;&#x6307;&#x5B9A;&#x7684; NameNode &#x7684;&#x5065;&#x5EB7;&#x72B6;&#x6001;.</p>
<p>  &#x8FDE;&#x63A5; NameNode &#x68C0;&#x67E5;&#x5065;&#x5EB7;&#xFF0C;NameNode &#x80FD;&#x591F;&#x6267;&#x884C;&#x4E00;&#x4E9B;&#x8BCA;&#x65AD;,&#x5305;&#x62EC;&#x68C0;&#x67E5;&#x5982;&#x679C;&#x5185;&#x90E8;&#x670D;&#x52A1;&#x6B63;&#x5728;&#x8FD0;&#x884C;&#x3002;&#x5982;&#x679C;&#x8FD4;&#x56DE; 0 &#x8868;&#x660E; NameNode &#x5065;&#x5EB7;&#xFF0C;&#x5426;&#x5219;&#x8FD4;&#x56DE;&#x975E; 0 .&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x6B64;&#x547D;&#x4EE4;&#x7528;&#x4E8E;&#x76D1;&#x6D4B;&#x76EE;&#x7684;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#xFF1A;&#x8FD9;&#x4E2A;&#x529F;&#x80FD;&#x5B9E;&#x73B0;&#x7684;&#x4E0D;&#x5B8C;&#x6574;&#xFF0C;&#x76EE;&#x524D;&#x9664;&#x975E; NameNode &#x5B8C;&#x5168;&#x7684;&#x5173;&#x95ED;&#xFF0C;&#x5176;&#x4ED6;&#x5168;&#x90E8;&#x8FD4;&#x56DE;&#x6210;&#x529F;&#x3002;</p>
</li>
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